In the city OP is living (I can tell from the ticket portal) there exists a physical card for regular Deutschland Tickets and you are free to choose from various providers with differing integrations and apps if you don’t want to buy it from the local transport authority. The corporate portal OP needs to use (due to his employer subsidizing the ticket) only offers a digital version that can be saved to Google/Apple Wallet, though. There are plenty of third party wallet apps allowing you to scan and store QR codes but the Deutschland Ticket renews on a monthly basis, which I think sadly requires a more sophisticated wallet app like Google/Apple wallet as the QR code changes each time the ticket renews
In the city OP is living (I can tell from the ticket portal) there exists a physical card for regular Deutschland Tickets and you are free to choose from various providers with differing integrations and apps if you don’t want to buy it from the local transport authority. The corporate portal OP needs to use (due to his employer subsidizing the ticket) only offers a digital version that can be saved to Google/Apple Wallet, though. There are plenty of third party wallet apps allowing you to scan and store QR codes but the Deutschland Ticket renews on a monthly basis, which I think sadly requires a more sophisticated wallet app like Google/Apple wallet as the QR code changes each time the ticket renews